視覚皮質の神経細胞のネットワーク解剖学と体内の生理学
Davi D Bock1, Wei-Chung Allen Lee, Aaron M Kerlin
1Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|March 11, 2011
まとめ
研究者はマウスの視覚皮質のニューラル接続をマッピングし,ニューロンの構造と機能を結びつけました. 阻害性内ニューロンは,さまざまな方向性偏好を持つ刺激性ニューロンから入力を受け,ネットワークの理解を助けます.
科学分野:
- 神経科学は神経科学である.
- 計算神経科学とは
- システム神経科学 システム神経科学
背景:
- 脳皮質を理解するには,神経回路と個々のニューロン機能をマッピングする必要があります.
- ニューラルネットワークの理解における現在の限界は,詳細な配線図がないことから生じている.
研究 の 目的:
- ネズミの主視野皮質における神経構造と機能の関係を調査する.
- 総合的な分析のために,in vivo生理学とネットワーク解剖学を組み合わせる.
主な方法:
- 2フォトンカルシウム画像を用いて,ニューロンの好ましい刺激指向を決定した.
- 連続的な薄い断面の大規模電子顕微鏡検査により,局所神経ネットワークの解剖学を追跡することが可能になった.
主要な成果:
- 機能的特性,特に好ましい刺激指向は,神経細胞のグループで特徴づけられました.
- 解剖学的追跡により,抑制性内ニューロンは,近くの刺激性ニューロンから収束的な入力を受け取ることが明らかになった.
- 興奮性ニューロンは,好ましい方向性の幅広い範囲を示し,強いバイアスが検出されませんでした.
結論:
- この研究は,脳皮質における神経構造と機能を結びつけるための実用的なアプローチを示しています.
- この発見は,視覚野の阻害性内ニューロンへの入力収束に関する予測を裏付けている.
関連する概念動画
Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Visual System
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
Once through the pupil, the light passes through the lens, a...
Neuron Structure
Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other using neurotransmitters at specific junctions called synapses. Neurons come in many shapes that often relate to their function, but most share three main structures: an axon and dendrites that extend out from a cell body.
Structure and Function of Neurons
The neuronal cell body—the soma— houses the nucleus and organelles vital to cellular...
Structure and Function of Neurons
The neuronal cell body—the soma— houses the nucleus and organelles vital to cellular...
Neuron Structure
Overview
Anatomy of the Eyeball
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
The Retina
The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.


